Nov. 10 is the Roman Catholic Church’s liturgical memorial of the fifth-century Pope Saint Leo I, known as “St. Leo the Great,” whose involvement in the fourth ecumenical council helped ...

He fought against the teachings of Eutyches, a monk who insisted that Jesus had only one nature. In 451 he wrote his famous 'Tome' sent to the Council of Chalcedon through the patriarch Flavian of ...

The universal Church celebrates the life of St. Leo IV on July 17 ... entirely rebuilding fifteen of the great towers. He was the first to enclose the Vatican hill by a wall.